The UK quattro Network

1985 Model Year - notes to Wiring Diagram 17

The main diagram does not identify the pin assignments for the rpm sender (G28) and timing position sender (G4). These are 3-2-1 in both cases, left to right. The diagram also suggests that the shield connection - the leftmost in each case - is connected to the sender. This is not the case - pin 3 should be open-circuit to both pins 1 and 2.
The main diagram shows F25 in track 50 as "normally open". This is incorrect - it is "normally closed" and opened at full throttle to de-energise N54, the full load enrichment solenoid.
The main diagram has the connections to terminals 58 and 58L transposed in tracks 68 & 69.
The main diagram shows K13 incorrectly in track 113. This warning light is in the digital dashboard - the connection should go to T35/24.
The main diagram does not identify power to L1/L13 - left main beam. Fuse 9 is missing from track 105. This causes further complications - one track is erroneously not peeled off the page carry-over and subsequent tracks taken down are one out. Take special care with Fuse 12 (Stephen) - check wire colours arriving in lower diagrams. The tables here have been corrected.
The main diagram shows a blue/yellow wire in track 33 from F60 (throttle body idle switch) to the ECU. This wire is actually brown/yellow.
The main diagram omits fuse 3 - 25A - from track 104. The diagram shows the brake lights and horn as unfused. The circuit is shown correctly in Diagram 18, the relevant ABS diagram.
The ABS diagram contains an explosion of pure fantasy unparalleled in the rest of the diagrams. The ur-quattro's ABS system is three-channel - the front wheels are controlled individually, and the rear wheels are controlled as a single logical entity. Yet Diagram 18 defines control valves for rear right, rear left and front right.
The voice synthesiser diagram is missing an important note - connectors T3a and T3b should NOT be connected together in a vehicle with the voice synthesiser fitted. Doing so causes spurious and persistent false warnings about the brake system.
The function of J67 - the diode pack - is not well described in tracks 63/64. See tracks 8/9 in diagram 19.
Fuse 12 (track 53) is incorrectly shown as connected to rail 31 - this is ludicrous because that's a chassis ground. It should be shown connected to rail X, directly from the ignition switch.
The symbols U1 and R in tracks 8 and 22 of Diagram 19 are reversed. A handwritten correction was made to the diagrams before they were scanned in.
Separate notes apply to the autocheck unit with voice synthesiser.

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